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Transmitter Controls
Control Knob: Each Transmitter has one main control knob, either a rotary knob or a
linear slider. Once the lens drive motor has been calibrated to the lens at
the Receiver/Amplifier, end-to-end travel of the knob moves the lens
through the range set during calibration. The travel can be set to be the
entire range of lens movement or between two intermediate points, as
desired by the operator. An important point to note is that the smaller the
range of travel of the motor, the more accurate the system becomes.
(This is the opposite of all other systems currently in use, which have
either a fixed accuracy or get less accurate as the range is reduced)
POWER Switch: The power switch turns power on and off to the Transmitter.
FWD/REV Switch: This switch reverses the direction of travel of the lens drive motor in
response to a movement of the control knob. The forward/reverse
designations are completely arbitrary, so simply choose whichever
matches the operator’s needs. The motor calibration does not need to
be redone when the direction is changed.
MOM/CONT Switch: This switch is used to select the desired operation of the camera
run/stop relay in the Receiver/Amplifier. Some cameras, such as an ARRI
16SR or 35-III require the external contact closure to be maintained
continuously for as long as the camera is running. Other cameras, such
as the Moviecam Compact, require a momentary contact closure to start
the camera and another momentary closure to stop the camera. This
switch is set to CONT for continuous operation cameras and MOM for
momentary operation cameras.
RUN/STOP Switch: This switch is used to activate the relay in the Receiver/Amplifier
that is used to put a film or video camera in the run or stop mode.
CHANNEL Select Switch: This switch is used to select one of the eight frequencies in
the 900 MHZ range for operation. The selector switch must be set to the
same channel on both the Transmitter and Receiver/Amplifier. As a
general rule, use the highest number that works in order to minimize
interference from video transmitters. If two BFD units are being used at
once, leave at least one unused channel between the two channels
being used, i.e. do not set the units on adjacent channels, such as 5
& 6! Also, do not use channels 3 & 7 simultaneously, as you may get
interference.
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